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Thin-Layer Vapor Deposition for Enhancement of Knee Voltage of R2T2 Ribbon

IP.com Disclosure Number: IPCOM000106021D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+4]

Abstract

It is desirable to have ribbons with high-interface resistance and knee voltage in ribbon-thermal-transfer (R2T2) printing so that printing current is lowered. Several methods have been developed for coating or depositing thin insulating layers of polymers on conductive polycarbonate among them, plasma polmerization. This disclosure describes a vapor deposition method that has the advantages of producing high-quality thin polymer layers suitable for mass production.

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Thin-Layer Vapor Deposition for Enhancement of Knee Voltage of R2T2 Ribbon

      It is desirable to have ribbons with high-interface resistance
and knee voltage in ribbon-thermal-transfer (R2T2) printing so that
printing current is lowered.  Several methods have been developed for
coating or depositing thin insulating layers of polymers on
conductive polycarbonate among them, plasma polmerization.  This
disclosure describes a vapor deposition method that has the
advantages of producing high-quality thin polymer layers suitable for
mass production.

      Parylene*, a thin-film polymer with very few pinholes was
selected for the vapor deposition technique because of its
durability.  Polycarbonate ribbons were deposited on one side with a
thin layer of Parylene, in a varity of thickness.  The layers were
then covered with 1000A of aluminum for ground return.  The figure
shows the current and input voltage requirements of a conductive
polycarbonate ribbon with no layer of Parylene and ribbons coated
with five different thicknesses of Parylene.  It can be seen that
both resistance and knee voltage increase with the increased
thickness of Parylene.  Other polymers, polyimide for example, also
can be used with this method.

* Trademark of the Union Carbide Corporation.